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Georg PurbachGeorg Purbach (May 30, 1423 - April 8, 1461) was a German astronomer and mathematician. He is credited with the invention of several scientific instruments, including the regula, the geometrical square, and the "Jacob's Staff." Purbach was the author of a seminal work in astronomy, Theoricae novae planetarum. Purbach, Georg Purbach, Georg Purbach, Georg Purbach, Georg
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